Chemise is a French term (which today simply means shirt)
In modern usage, a chemise is generally a woman's garment that vaguely resembles the older shirts but is typically more delicate
Most commonly the term refers to a loose-fitting, sleeveless undergarment or type of lingerie which is unfitted at the waist.
It can also refer to a short, sleeveless dress that hangs straight from the shoulders and fits loosely at the waist.
A chemise typically does not have any buttons or other fasteners and is put on by either dropping it over the head or stepping into it and lifting it up.